An extremely popular toy in Australia, the "Bindeez" bead pen, has been banned across the country after it was discovered that the beads, if ingested, metabolize into gamma-hydroxybutyrate, known on the street as "GHB." GHB causes a feeling of euphoria in lower doses, but can cause a loss of consciousness at higher doses.
I've heard it can also cause you to periodically nod off into a nightmare zone, only to return from your momentary terror with no memories of the experience besides an aftertaste of panic, which fades quickly enough in the alcohol-like euphoria to make you forget that the next descent into the punk-and-bloat dimension is just seconds away.
Anyway, they'll be off the shelves soon if they aren't already. Buy now!